34
The following diagram requires AND LOAD to be converted to mnemonic
code because three pairs of parallel conditions lie in series. The two means
of coding the programs are also shown.
0000
0002
0004
0001
0003
0005
0100
Address
Instruction
Operands
Address
Instruction
Operands
0000
LD
0000
0001
OR NOT
0001
0002
LD NOT
0002
0003
OR
0003
0004
AND LD
---
0005
LD
0004
0006
OR
0005
0007
AND LD
---
0008
OUT
0100
0000
LD
0000
0001
OR NOT
0001
0002
LD NOT
0002
0003
OR
0003
0004
LD
0004
0005
OR
0005
0006
AND LD
---
0007
AND LD
---
0008
OUT
0100
Again, with the method on the right, a maximum of eight blocks can be com-
bined. There is no limit to the number of blocks that can be combined with
the first method.
The following diagram requires OR LOAD instructions to be converted to
mnemonic code because three pairs of conditions in series lie in parallel to
each other.
0000
0001
0002
0003
0040
0005
0101
The first of each pair of conditions is converted to LOAD with the assigned bit
operand and then ANDed with the other condition. The first two blocks can
be coded first, followed by OR LOAD, the last block, and another OR LOAD,
or the three blocks can be coded first followed by two OR LOADs. The mne-
monic code for both methods is shown below.
0000
LD
0000
0001
AND NOT
0001
0002
LD NOT
0002
0003
AND NOT
0003
0004
OR LD
---
0005
LD
0004
0006
AND
0005
0007
OR LD
---
0008
OUT
0101
0000
LD
0000
0001
AND NOT
0001
0002
LD NOT
0002
0003
AND NOT
0003
0004
LD
0004
0005
AND
0005
0006
OR LD
---
0007
OR LD
---
0008
OUT
0101
Address
Instruction
Operands
Address
Instruction
Operands
Again, with the method on the right, a maximum of eight blocks can be com-
bined. There is no limit to the number of blocks that can be combined with
the first method.
The Ladder Diagram
Section 4-3
Содержание SYSMAC C20K
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Страница 2: ...K type Programmable Controllers OPERATION MANUAL Revised July 1999 ...
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Страница 19: ...7 SECTION 2 Hardware Considerations 2 1 Introduction 2 2 Indicators 2 3 PC Configuration ...
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